Final answer:
The content of the Humor Club meetings is best described by the word 'agenda', referring to the structured plan of swapping funny stories and doing humorous imitations.
Step-by-step explanation:
The agenda of our Humor Club meetings usually consists of two activities: swapping funny stories and then doing humorous imitations of actors or politicians. An agenda is a plan or list of items to be discussed or done during a meeting. While 'dialogue' refers to communication between characters, in the context of this question, 'agenda' better describes the pre-planned structure of a meeting.
Not only does an agenda serve to guide the meeting's discussion, but it also ensures an organized approach to the activities, such as the swapping of funny stories and doing imitations, which are typical elements found in the realm of comedy.